wk.py

from threading import Thread

import wikipedia

from kivy.app import App
from kivy.lang import Builder
from kivy.factory import Factory
from kivy.properties import ListProperty, BooleanProperty


KV = '''
<Result@Label>:
    text_size: self.size
    font_size: 20
    shorten: True
    color: rgba('#11111F')

    canvas.before:
        Rectangle:
            pos: self.pos
            size: self.size

BoxLayout:
    orientation: 'vertical'
    TextInput:
        multiline: False
        size_hint_y: None
        height: self.minimum_height
        font_size: 20
        on_text_validate: app.search(self.text)

    FloatLayout:
        RecycleView:
            pos_hint: {'pos': (0, 0)}
            data: app.search_results
            viewclass: 'Result'
            RecycleBoxLayout:
                orientation: 'vertical'
                size_hint_y: None
                height: self.minimum_height
                default_size_hint: 1, None
                default_size: 0, 50

                padding: 10, 10
                spacing: 10

        Image:
            pos_hint: {'pos': (0, 0)}
            source: 'data/images/image-loading.zip'
            opacity: 1 if app.loading else 0
            canvas.before:
                Color:
                    rgba: 0, 0, 0, .5
                Rectangle:
                    pos: self.pos
                    size: self.size
'''

class Application(App):
    search_results = ListProperty()
    loading = BooleanProperty(False)

    def build(self):
        return Builder.load_string(KV)

    def search(self, text):
        t = Thread(target=self._search, args=[text]).start()
        self.loading = True

    def _search(self, text):
        self.search_results = [
            {'text': text}
            for text in
            wikipedia.search(text, results=20)
        ]
        self.loading = False


if __name__ == "__main__":
    Application().run()